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I guess more specifically the amount of new support a theory gains from having additional adherents scales in a somwhat logarithmic fashion, tapering off quickly after a point. There are also epistemic access problems and so forth.
There is probably a perfectly rational way to redesign democracy so that it works. Epistocratic conceits only get halfway there. The problem isn't entirely one of intelligence, though intelligence makes for better measurements. It's firstly a problem of actually measuring at all.
